Major U.S. carrier expanding to most destinations globally with redesigned Polaris business class in 2026
Frequent domestic travelers seeking high-frequency options and MileagePlus rewards
Short Answer
United Airlines operates 58 more aircraft (982 vs 924) and has a larger domestic network strategy, while Delta maintains a slightly newer fleet composition with more modern Airbus models. Both airlines have similar fleet ages of 15 years and compete intensely across major markets, with the choice depending on route availability, frequent flyer preferences, and credit card benefits.
Our Verdict
Both Delta and United Airlines are competitive carriers in 2026 with comparable operations, pricing, and loyalty programs. Delta edges ahead with a more modernized narrowbody fleet composition and widebody international strategy, while United operates more total aircraft and focuses on high-frequency domestic expansion. The better choice depends on your preferred routes, frequent flyer status, and credit card rewards alignment.
Delta Air Lines7.1
7.9United Airlines
Choose Delta Air Lines if
International travelers seeking modern aircraft and premium service
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Key Differences at a Glance
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Total Mainline Fleet Size:United Airlines wins (982 aircraft vs 924 aircraft)
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Average Fleet Age:15 years vs 15 years
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Newest Airbus Narrowbody:Delta Air Lines wins (A321neo (second most operated) vs A321neo (recent deliveries began))
Both airlines have an average fleet age of 15 years, but Delta has a slight edge in fleet modernization. Delta operates the A321neo as its second most common aircraft, indicating stronger commitment to new Airbus narrowbodies. United is only beginning deliveries of A321neo aircraft, though they have A321XLRs on order for future ultra-long-haul expansion.
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